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The Griffiths phase-like features and the spin-phonon coupling effectsobserved in Tb$_2$NiMnO$_6$ are reported. The double perovskite compoundcrystallizes in monoclinic $P2_1/n$ space group and exhibits a magnetic phasetransition at $T_c \sim$ 111 K as an abrupt change in magnetization. A negativedeviation from ideal Curie-Weiss law exhibited by 1/$\chi(T)$ curves andless-than-unity susceptibility exponents from the power-law analysis of inversesusceptibility are reminiscent of Griffiths phase-like features. Arrott plotsderived from magnetization isotherms support the inhomogeneous nature ofmagnetism in this material. The observed effects originate fromantiferromagnetic interactions which arise from inherent disorder in thesystem. Raman scattering experiments display no magnetic-order-induced phononrenormalization below $T_c$ in Tb$_2$NiMnO$_6$ which is different from theresults observed in other double perovskites and is correlated to the smallersize of the rare earth. The temperature evolution of full-width-at-half-maximumfor the {\it stretching} mode at 645 cm$^{-1}$ presents an anomaly whichcoincides with the magnetic transition temperature and signals a closeconnection between magnetism and lattice in this material.

Griffiths phase-like behaviour and spin-phonon coupling in double perovskite Tb$_{2}$NiMnO$_{6}$